Question

Using identity find (77)²​

Answer 1

Answer:

(100-23)^2

100^2-2×100×23+23^2

10000-4600+529

5400+529

5929

Step-by-step explanation:

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Answer 2

Answer:

5929

Step-by-step explanation:

(70+7)²

=(70)²+2(70+7)+(7)²{use identity = (a+b)²=a²+2ab+b²}

=4900+2(70)(7)+(7)²

=4900+ 2× 490+49

=4949+980

= 5929

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